PC Gamer DVD Issue 147 (Side B) (April 2005) PCG147DB0405
February 25, 2014
As far as I know (and I the physical issues to prove it), PC Gamer didn't begin numbering their CDs until #150, July 2006. The June 2006 issue had the key #7.67 on both the disc and the magazine's spine.
So, if anyone can scan the sleeve or their discs to clarify this matter, it would really help us all here.